linux/include/linux/netfilter/nf_conntrack_sip.h
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   1#ifndef __NF_CONNTRACK_SIP_H__
   2#define __NF_CONNTRACK_SIP_H__
   3#ifdef __KERNEL__
   4
   5#include <net/netfilter/nf_conntrack_expect.h>
   6
   7#include <linux/types.h>
   8
   9#define SIP_PORT        5060
  10#define SIP_TIMEOUT     3600
  11
  12struct nf_ct_sip_master {
  13        unsigned int    register_cseq;
  14        unsigned int    invite_cseq;
  15        __be16          forced_dport;
  16};
  17
  18enum sip_expectation_classes {
  19        SIP_EXPECT_SIGNALLING,
  20        SIP_EXPECT_AUDIO,
  21        SIP_EXPECT_VIDEO,
  22        SIP_EXPECT_IMAGE,
  23        __SIP_EXPECT_MAX
  24};
  25#define SIP_EXPECT_MAX  (__SIP_EXPECT_MAX - 1)
  26
  27struct sdp_media_type {
  28        const char                      *name;
  29        unsigned int                    len;
  30        enum sip_expectation_classes    class;
  31};
  32
  33#define SDP_MEDIA_TYPE(__name, __class)                                 \
  34{                                                                       \
  35        .name   = (__name),                                             \
  36        .len    = sizeof(__name) - 1,                                   \
  37        .class  = (__class),                                            \
  38}
  39
  40struct sip_handler {
  41        const char      *method;
  42        unsigned int    len;
  43        int             (*request)(struct sk_buff *skb, unsigned int protoff,
  44                                   unsigned int dataoff,
  45                                   const char **dptr, unsigned int *datalen,
  46                                   unsigned int cseq);
  47        int             (*response)(struct sk_buff *skb, unsigned int protoff,
  48                                    unsigned int dataoff,
  49                                    const char **dptr, unsigned int *datalen,
  50                                    unsigned int cseq, unsigned int code);
  51};
  52
  53#define SIP_HANDLER(__method, __request, __response)                    \
  54{                                                                       \
  55        .method         = (__method),                                   \
  56        .len            = sizeof(__method) - 1,                         \
  57        .request        = (__request),                                  \
  58        .response       = (__response),                                 \
  59}
  60
  61struct sip_header {
  62        const char      *name;
  63        const char      *cname;
  64        const char      *search;
  65        unsigned int    len;
  66        unsigned int    clen;
  67        unsigned int    slen;
  68        int             (*match_len)(const struct nf_conn *ct,
  69                                     const char *dptr, const char *limit,
  70                                     int *shift);
  71};
  72
  73#define __SIP_HDR(__name, __cname, __search, __match)                   \
  74{                                                                       \
  75        .name           = (__name),                                     \
  76        .len            = sizeof(__name) - 1,                           \
  77        .cname          = (__cname),                                    \
  78        .clen           = (__cname) ? sizeof(__cname) - 1 : 0,          \
  79        .search         = (__search),                                   \
  80        .slen           = (__search) ? sizeof(__search) - 1 : 0,        \
  81        .match_len      = (__match),                                    \
  82}
  83
  84#define SIP_HDR(__name, __cname, __search, __match) \
  85        __SIP_HDR(__name, __cname, __search, __match)
  86
  87#define SDP_HDR(__name, __search, __match) \
  88        __SIP_HDR(__name, NULL, __search, __match)
  89
  90enum sip_header_types {
  91        SIP_HDR_CSEQ,
  92        SIP_HDR_FROM,
  93        SIP_HDR_TO,
  94        SIP_HDR_CONTACT,
  95        SIP_HDR_VIA_UDP,
  96        SIP_HDR_VIA_TCP,
  97        SIP_HDR_EXPIRES,
  98        SIP_HDR_CONTENT_LENGTH,
  99        SIP_HDR_CALL_ID,
 100};
 101
 102enum sdp_header_types {
 103        SDP_HDR_UNSPEC,
 104        SDP_HDR_VERSION,
 105        SDP_HDR_OWNER,
 106        SDP_HDR_CONNECTION,
 107        SDP_HDR_MEDIA,
 108};
 109
 110struct nf_nat_sip_hooks {
 111        unsigned int (*msg)(struct sk_buff *skb,
 112                            unsigned int protoff,
 113                            unsigned int dataoff,
 114                            const char **dptr,
 115                            unsigned int *datalen);
 116
 117        void (*seq_adjust)(struct sk_buff *skb,
 118                           unsigned int protoff, s16 off);
 119
 120        unsigned int (*expect)(struct sk_buff *skb,
 121                               unsigned int protoff,
 122                               unsigned int dataoff,
 123                               const char **dptr,
 124                               unsigned int *datalen,
 125                               struct nf_conntrack_expect *exp,
 126                               unsigned int matchoff,
 127                               unsigned int matchlen);
 128
 129        unsigned int (*sdp_addr)(struct sk_buff *skb,
 130                                 unsigned int protoff,
 131                                 unsigned int dataoff,
 132                                 const char **dptr,
 133                                 unsigned int *datalen,
 134                                 unsigned int sdpoff,
 135                                 enum sdp_header_types type,
 136                                 enum sdp_header_types term,
 137                                 const union nf_inet_addr *addr);
 138
 139        unsigned int (*sdp_port)(struct sk_buff *skb,
 140                                 unsigned int protoff,
 141                                 unsigned int dataoff,
 142                                 const char **dptr,
 143                                 unsigned int *datalen,
 144                                 unsigned int matchoff,
 145                                 unsigned int matchlen,
 146                                 u_int16_t port);
 147
 148        unsigned int (*sdp_session)(struct sk_buff *skb,
 149                                    unsigned int protoff,
 150                                    unsigned int dataoff,
 151                                    const char **dptr,
 152                                    unsigned int *datalen,
 153                                    unsigned int sdpoff,
 154                                    const union nf_inet_addr *addr);
 155
 156        unsigned int (*sdp_media)(struct sk_buff *skb,
 157                                  unsigned int protoff,
 158                                  unsigned int dataoff,
 159                                  const char **dptr,
 160                                  unsigned int *datalen,
 161                                  struct nf_conntrack_expect *rtp_exp,
 162                                  struct nf_conntrack_expect *rtcp_exp,
 163                                  unsigned int mediaoff,
 164                                  unsigned int medialen,
 165                                  union nf_inet_addr *rtp_addr);
 166};
 167extern const struct nf_nat_sip_hooks *nf_nat_sip_hooks;
 168
 169int ct_sip_parse_request(const struct nf_conn *ct, const char *dptr,
 170                         unsigned int datalen, unsigned int *matchoff,
 171                         unsigned int *matchlen, union nf_inet_addr *addr,
 172                         __be16 *port);
 173int ct_sip_get_header(const struct nf_conn *ct, const char *dptr,
 174                      unsigned int dataoff, unsigned int datalen,
 175                      enum sip_header_types type, unsigned int *matchoff,
 176                      unsigned int *matchlen);
 177int ct_sip_parse_header_uri(const struct nf_conn *ct, const char *dptr,
 178                            unsigned int *dataoff, unsigned int datalen,
 179                            enum sip_header_types type, int *in_header,
 180                            unsigned int *matchoff, unsigned int *matchlen,
 181                            union nf_inet_addr *addr, __be16 *port);
 182int ct_sip_parse_address_param(const struct nf_conn *ct, const char *dptr,
 183                               unsigned int dataoff, unsigned int datalen,
 184                               const char *name, unsigned int *matchoff,
 185                               unsigned int *matchlen, union nf_inet_addr *addr,
 186                               bool delim);
 187int ct_sip_parse_numerical_param(const struct nf_conn *ct, const char *dptr,
 188                                 unsigned int off, unsigned int datalen,
 189                                 const char *name, unsigned int *matchoff,
 190                                 unsigned int *matchen, unsigned int *val);
 191
 192int ct_sip_get_sdp_header(const struct nf_conn *ct, const char *dptr,
 193                          unsigned int dataoff, unsigned int datalen,
 194                          enum sdp_header_types type,
 195                          enum sdp_header_types term,
 196                          unsigned int *matchoff, unsigned int *matchlen);
 197
 198#endif /* __KERNEL__ */
 199#endif /* __NF_CONNTRACK_SIP_H__ */
 200